if (document.images)
{      
  signouton = new Image();		
  signouton.src = "images/layout/signout_a.gif";
  signoutoff = new Image();		  	
  signoutoff.src = "images/layout/signout.gif";

  signinon = new Image();		
  signinon.src = "images/layout/signin_a.gif";
  signinoff = new Image();		  	
  signinoff.src = "images/layout/signin.gif";

  registeron = new Image();		
  registeron.src = "images/layout/register_a.gif";
  registeroff = new Image();		  	
  registeroff.src = "images/layout/register.gif";

  submiton = new Image();		
  submiton.src = "images/layout/submit_a.gif";
  submitoff = new Image();		  	
  submitoff.src = "images/layout/submit.gif";
}

function imgOn(imgName)
{
  if (document.images)
    document[imgName].src = eval(imgName + "on.src");
}
			
function imgOff(imgName)
{
  if (document.images)
    document[imgName].src = eval(imgName + "off.src");
}

function signinOn(field)
{
  field.src = "images/layout/signin_a.gif";
}

function signinOff(field)
{
  field.src = "images/layout/signin.gif";
}

function submitOn(field)
{
  field.src = "images/layout/submit_a.gif";
}

function submitOff(field)
{
  field.src = "images/layout/submit.gif";
}